I would have some questions...
How did you integrate the PDF file into your course (just a link, addes from edition in the course???)
Do you have any other web browser (I know this one sounds strange)
Localy, you said it look like it's working locally, what is the difference (how did you "upload" the PDF both ways?
By document it's accessible. Can you import it in a course?
I think this is it for this time.